percent-format

simple printf-style string formatting https://github.com/rudymatela/percent-format#readme

This package is not currently in any snapshots. If you're interested in using it, we recommend adding it to Stackage Nightly. Doing so will make builds more reliable, and allow stackage.org to host generated Haddocks.

BSD-3-Clause licensed and maintained by Rudy Matela

PercentFormat – C-like printf-style string formatting for Haskell

The Text.PercentFormat library provides printf-style string formatting. It provides a % operator (as in Ruby or Python) and uses the old C-printf-style format you know and love.

This library differs from Text.Printf in that it does not rely on custom typeclasses – it works on anything that is a Show instance.

Formatting one value:

> import Text.PercentFormat
> "Hello %s!" -% "World"
"Hello World!"

Formatting three values, tuple style:

> "load average: %1.2f %1.2f %1.2f" -%%% (0.00, 0.066, 0.11)
"load average: 0.00 0.07 0.11"

Formatting three values, chain style:

> "load average: %1.2f %1.2f %1.2f" % 0.00 % 0.066 -% 0.11
"load average: 0.00 0.07 0.11"

To produce a string with a percent sign (%), use two percent signs (%%):

> "memory usage: %i%%" -% 13
"memory usage: 13%"

Percent signs are duplicated when using the % operator to allow chaining:

> "percent sign: %s, memory usage: %i%%" % "%" % 87
"percent sign: %%, memory usage: 87%%"

Always use the -% operator when formatting the last value to remove duplicate % signs:

> "percent sign: %s, memory usage: %i%%" % "%" -% 87
"percent sign: %, memory usage: 87%"

To print, just prefix you format expression with putStrLn $:

> putStrLn $ "Hello %s!" -% "World"
Hello World!